VWF and systemic lupus erythematosus: The activities of factors II (FII), V (FV), VII (FVII), VIII (FVIII), IX (FIX), X (FX), XI (FXI), and von Willebrand factor (VWF, both antigen and activity) were all within normal ranges, while the lupus anticoagulant standardized ratio was 1.3.